Selective Hydrogen Combustion Catalyst for Methanol Aromatization
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Solution Overview
Problem
Conventional methods for converting methanol to aromatics are non-selective and prone to temperature excursions, leading to reduced aromatic yield and increased production of undesired side products like hydrogen, which complicates separation and equipment operation.
Innovation Solution
A catalyst system comprising an aromatization component, such as ZSM-5, combined with a selective hydrogen combustion (SHC) component that includes metals from specific groups of the Periodic Table, allows for simultaneous conversion of oxygenated hydrocarbons to aromatics and selective combustion of hydrogen to water, shifting thermodynamic equilibrium in favor of aromatic production and managing heat through endothermic reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methanol conversion methods are used, then aromatic production is achieved, but hydrogen is produced as a byproduct which complicates separation and reduces selectivity
Solution Approach 1:
The patent converts the harmful hydrogen byproduct into water through selective hydrogen combustion. The SHC catalyst oxidizes hydrogen to water, eliminating the separation problem and improving aromatic selectivity. This transforms a harmful byproduct into a benign product, resolving the contradiction between aromatic yield and hydrogen production.
Solution Approach 2:
The patent combines the aromatization catalyst (ZSM-5) with the SHC catalyst into a single integrated catalyst system. This merging allows simultaneous aromatization and hydrogen combustion to occur in one reactor, eliminating the need for separate hydrogen removal equipment and improving overall process efficiency.
2Productivity
If methanol conversion is performed without heat management, then reaction proceeds, but temperature excursions occur leading to reduced aromatic selectivity
Solution Approach 1:
The patent converts the harmful heat generation into a beneficial process by using SHC to consume hydrogen, which is an endothermic process. This endothermic hydrogen combustion helps manage the exothermic aromatization reactions, preventing temperature excursions and maintaining aromatic selectivity while keeping the reaction productive.
Solution Approach 2:
The patent changes the thermal parameters of the reaction system by introducing an endothermic hydrogen combustion process. This parameter change (adding endothermic reaction) counterbalances the exothermic aromatization, achieving better temperature control while maintaining high reaction rates and aromatic selectivity.
3Temperature
If excessive heat removal is used to control temperature, then temperature stability is improved, but equipment size and complexity increase
Solution Approach 1:
The patent converts the need for external heat removal into an internal heat management solution. The SHC catalyst performs hydrogen combustion in-situ, which is endothermic and naturally absorbs heat from the exothermic aromatization reactions. This eliminates the need for large external heat removal equipment while maintaining temperature stability.
Solution Approach 2:
The catalyst system performs self-heat-management through the coupled reactions. The SHC component automatically consumes hydrogen and manages heat generation without requiring external intervention or complex heat removal equipment. The system self-regulates temperature through the inherent thermodynamics of the coupled reactions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances aromatic yield by reducing hydrogen production and managing heat effectively, thereby improving selectivity and stability, reducing the need for excessive heat removal and equipment size, and increasing the production of desirable aromatics.
Implementation Method 1
a catalyst system comprising at least one aromatization component and at least one selective hydrogen combustion ('SHC') component
Implementation Method 2
selective combustion of the resulting hydrogen to water
Implementation Method 3
selective hydrogen combustion ('SHC') component
Implementation Method 4
the combustion of hydrogen in the presence of the SHC component is optionally endothermic, which helps manage the heat generated by the exothermic conversion of the oxygenated hydrocarbon to aromatics
Data Source
AI summary
A catalyst system and processes for combined aromatization and selective hydrogen combustion of oxygenated hydrocarbons are disclosed. The catalyst system contains at least one aromatization component and at least one selective hydrogen combustion component. The process is such that the yield of hydrogen is less than the yield of hydrogen when contacting the hydrocarbons with the aromatization component alone.